Question

Figure 7.4

A 0.12 kg block is held in
place againstthe spring by a 35 N horizontal external force. The
external forceis removed, and the block is projected with a
velocityv1= 1.2 m/s upon
separation from thespring. The block descends a ramp and has a
velocityv2= 1.4 m/s at the
bottom. The trackis frictionless between points A and B. The track
is frictionlessbetween points A and B. The block enters a rough
section at B,extending to E. The coefficient of kinetic friction is
0.26. Thevelocity of the block isv3=1.4 at C. The block moves on to D,
where it stops. In Figure 7.4,the initial compression of the
spring, in cm, is closestto: